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irqchip/msi-lib: Refuse initialization when irq_write_msi_msg() is missing

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MSI parent domains rely on the fact that the top level device domain
provides a irq_write_msi_msg() callback.

Check for that and if missing warn and refuse to initialize the device domain.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/87a4xp35cn.ffs@tglx
This commit is contained in:
Thomas Gleixner 2026-02-03 22:05:44 +01:00
parent 6de23f81a5
commit aa80869b77
1 changed files with 3 additions and 0 deletions
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3
drivers/irqchip/irq-msi-lib.c
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@ -48,6 +48,9 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
return false;
}
if (WARN_ON_ONCE(!chip->irq_write_msi_msg))
return false;
required_flags = pops->required_flags;
/* Is the target domain bus token supported? */